feat(ory): replace hardcoded DSN + secrets with OpenBao DB engine + VSO

All Ory service credentials now flow from OpenBao through VSO instead
of being hardcoded in Helm values or Deployment env vars.

Kratos:
- Remove config.dsn; flip secret.enabled=false with nameOverride pointing
  at kratos-app-secrets (a VSO-managed Secret with secretsDefault,
  secretsCookie, smtpConnectionURI).
- Inject DSN at runtime via deployment.extraEnv from kratos-db-creds
  (VaultDynamicSecret backed by OpenBao database static role, 24h rotation).

Hydra:
- Remove config.dsn; inject DSN via deployment.extraEnv from hydra-db-creds
  (VaultDynamicSecret, same rotation scheme).

Login UI:
- Replace hardcoded COOKIE_SECRET/CSRF_COOKIE_SECRET env var values with
  secretKeyRef reads from login-ui-secrets (VaultStaticSecret → secret/login-ui).

vault-secrets.yaml adds: VaultAuth, Hydra VSS, kratos-app-secrets VSS,
login-ui-secrets VSS, kratos-db-creds VDS, hydra-db-creds VDS.

base/ory/kratos-values.yaml

@@ -1,13 +1,12 @@
 # Base Ory Kratos Helm values.
 # DOMAIN_SUFFIX is replaced at apply time via sed.
-# DSN is set in config (chart renders it into kratos-secrets Secret automatically).
+# DSN and secrets come from K8s Secrets managed by VSO VaultDynamicSecret/VaultStaticSecret.
 
 kratos:
   automigration:
     enabled: true
   config:
     version: v0.13.0
-    dsn: "postgresql://kratos:localdev@postgres-rw.data.svc.cluster.local:5432/kratos_db?sslmode=disable"
 
     selfservice:
       default_browser_return_url: https://auth.DOMAIN_SUFFIX/
@@ -54,12 +53,21 @@ kratos:
       admin:
         base_url: http://kratos-admin.ory.svc.cluster.local:4434/
 
-# Chart creates kratos-secrets from Helm values (dsn + generated random secrets).
+# Chart does not manage secrets — we create them externally via VSO.
+# secret.nameOverride points chart at our VaultStaticSecret-managed K8s secret so
+# the chart injects SECRETS_DEFAULT/SECRETS_COOKIE from kratos-app-secrets automatically.
+# DSN is not injected by the chart when secret.enabled=false — we add it via extraEnv.
 secret:
-  enabled: true
-  nameOverride: kratos-secrets
+  enabled: false
+  nameOverride: kratos-app-secrets
 
 deployment:
+  extraEnv:
+    - name: DSN
+      valueFrom:
+        secretKeyRef:
+          name: kratos-db-creds
+          key: dsn
   resources:
     limits:
       memory: 64Mi